Surgery – Instruments – Means for removing tonsils – adenoids or polyps
Reexamination Certificate
2000-03-27
2001-06-12
Hirsch, Paul J. (Department: 3732)
Surgery
Instruments
Means for removing tonsils, adenoids or polyps
C606S114000
Reexamination Certificate
active
06245078
ABSTRACT:
REFERENCED-APPLICATIONS
The present disclosure relates to subject matter contained in Japanese Patent Application No. 11-117415 (filed on Apr. 26, 1999), which is expressly incorporated herein by reference in its entirety.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
Not Applicable
REFERENCE TO A MICROFICHE APPENDIX
Not Applicable
BACKGROUND OF THE INVENTION
1. Description of Prior Art
In general, a snare for use with an endoscope has a snare wire formed from an elastic wire that is connected to the distal end of a control wire axially movably inserted in a flexible sheath. The snare wire projects from or withdraws into the distal end of the flexible sheath in response to an operation of advancing or retracting the control wire in the axial direction. When projecting from the distal end of the flexible sheath, the snare wire expands in a loop shape by its own elasticity. When pulled into the distal end of the flexible sheath, the snare wire contracts.
However, the snare having the above-described simple structure suffers from a problem arising when a stemless polyp or the like is to be bound tight with the snare wire. That is, when a stemless polyp is encircled with the snare wire expanded in a loop shape and the snare wire is contracted by pulling the control wire, the snare wire may slip on the surface of the polyp and fail to pinch it.
Accordingly, the conventional practice is to secure a plurality of anti-slip tips to the snare wire so that the anti-slip tips project from the inner surface of the loop to bite into the polyp when the snare wire is contracted, thereby preventing the snare wire from slipping off (for example, see Japanese Utility Model Application Post-Examination Publication No. 6-3549).
However, the structure in which a plurality of anti-slip tips are secured to the snare wire gives rise to another problem. That is, the process of manufacturing the snare becomes extremely complicated. In addition, the tips may catch on the distal end of the flexible sheath or another tip, making the wire loop difficult to expand or contract smoothly.
2. Field of the Invention
The present invention relates to a snare that is inserted into an instrument passage of an endoscope to excise a polyp.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide a snare for an endoscope that is capable of readily and surely binding a polyp tight with a snare wire and easy to manufacture and that allows the snare wire to be expanded or contacted smoothly.
Other objects and advantages of the present invention will become apparent from the following detailed description of illustrated embodiments of the invention.
According to the present invention, there is provided a snare for an endoscope including a flexible sheath and a control wire axially movably inserted in the flexible sheath. A snare wire is connected to the distal end of the control wire. The snare wire is formed from an elastic wire. When the control wire is advanced axially, the snare wire projects from the distal end of the flexible sheath and expands in a loop shape by its own elasticity. When the control wire is retracted axially, the snare wire is pulled into the distal end of the flexible sheath and thus contracted. The distal end surface of the flexible sheath is provided with a plurality of claw-shaped projections projecting forward in parallel to each other.
REFERENCES:
patent: 3739784 (1973-06-01), Itoh
patent: 3828790 (1974-08-01), Curtiss et al.
patent: 4643187 (1987-02-01), Okada
patent: 5084054 (1992-01-01), Bencini et al.
patent: 5108406 (1992-04-01), Lee
patent: 5201740 (1993-04-01), Nakao et al.
patent: 5201741 (1993-04-01), Dulebohn
patent: 5281238 (1994-01-01), Chin et al.
patent: 5417697 (1995-05-01), Wilk et al.
patent: 5746747 (1998-05-01), McKeating
patent: 6036698 (2000-03-01), Fawzi et al.
patent: 6068603 (2000-05-01), Suzuki
patent: 6-3549 (1994-02-01), None
Asahi Kogaku Kogyo Kabushiki Kaisha
Greenblum & Bernstein P.L.C.
Hirsch Paul J.
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